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Potential Impacts of Projected Sea-Level Rise on Sea Turtle Rookeries

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AQUATIC CONSERVATION: MARINE AND FRESHWATER ECOSYSTEMS Aquatic Conserv: Mar. Freshw. Ecosyst. (2009) Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/aqc.1088 Potential impacts of projected sea-level rise on sea turtle rookeries MMPB FUENTESa,Ã, CJ LIMPUSb, M HAMANNc and J DAWSON aSchool of Earth and Environmental Sciences, James Cook University, Australia bQueensland Environmental Protection Agency, Brisbane, Australia cSchool of Earth and Environmental Sciences, James Cook University, Australia ABSTRACT 1. Projected sea-level rise (SLR) is expected to cause shoreline erosion, saline intrusion into the water table and inundation and flooding of beaches and coastal areas. Areas most vulnerable to these physical impacts include small, tropical low-lying islands, which are often key habitat for threatened and endemic species, such as sea turtles. 2. Successful conservation of threatened species relies upon the ability of managers to understand current threats and to quantify and mitigate future threats to these species. This study investigated how sea-level rise might affect key rookeries (nesting grounds) (n 5 8) for the northern Great Barrier Reef (nGBR) green turtle population, the largest green turtle population in the world. 3. 3-D elevation models were developed and applied to three SLR scenarios projected by the IPCC 2007 and an additional scenario that incorporates ice melting. Results indicate that up to 38% of available nesting area across all the rookeries may be inundated as a result of SLR. 4. Flooding, as a result of higher wave run-up during storms, will increase egg mortality at these rookeries affecting the overall reproductive success of the nGBR green turtle population. Information provided will aid managers to prioritize conservation efforts and to use realistic measures to mitigate potential SLR threats to the nGBR green turtle population. Copyright r 2009 John Wiley & Sons, Ltd. Received 13 January 2009; Revised 13 June 2009; Accepted 8 October 2009 KEY WORDS: sea turtles; green turtles; sea-level rise; habitat loss; climate change; reef island; Great Barrier Reef; Torres Strait INTRODUCTION 1993; Fish et al., 2005, 2008; Baker et al., 2006; LaFever et al., 2007). This is expected to cause a plethora of biogeophysical Sea level is anticipated to rise significantly in the future, with a and socio-economic consequences producing a cascade of projected sea-level rise (SLR) of 18 to 59 cm by 2100, and a impacts (Klein and Nicholls, 1999). Assessments of the possible additional 10 to 20 cm increase from melting ice sheets impacts of projected SLR at areas of high human population and glaciers (Overpeck et al., 2006; McInnes and O’Farrell, density, economic importance and/or areas that have high 2007; Meehl et al., 2007). Small, tropical low-lying islands, environmental value (e.g. areas important for threatened especially those that are not vegetated or lie on exposed reefs in species), can aid resource management planning and areas of high tidal range, are the most vulnerable to SLR conservation of wildlife that rely on areas at risk (Baker (Woodroffe et al., 1999; Church and White, 2006). Impacts et al., 2006; Cowell et al., 2006). anticipated from SLR include saline intrusion into the water Currently, concerns exist regarding the impacts of SLR on table as well as inundation and flooding of beaches and the most important rookery, Raine Island, and several of the shoreline erosion of coastal areas (Klein and Nicholls, 1999; smaller cays (e.g. Bramble Cay) used by the largest green turtle Mimura, 1999). Previous studies indicate that the most (Chelonia mydas) population in the world: the northern Great significant impacts will be at residential and recreational Barrier Reef (nGBR) green turtle population. This population areas, agricultural land (Nicholls, 2002; Snoussi et al., 2008), nests at rookeries in the far nGBR and Torres Strait region, wetlands (Nicholls et al., 1999; Nicholls, 2004) and habitats for with an average of 50 000 turtles on a high nesting year threatened, endangered and endemic species (Daniels et al., (Limpus et al., 2003). Over the last 10 years a reduction in *Correspondence to: MMPB Fuentes, School of Earth and Environmental Sciences, James Cook University, Australia. E-mail: [email protected] Copyright r 2009 John Wiley & Sons, Ltd. MMPB FUENTES ET AL. hatching success has been observed at Raine Island, which is thought to be caused by rising groundwater and other geomorphic processes (e.g. movement of sand) (Limpus et al., 2003). It is believed that SLR is likely to exacerbate these processes and the frequency of nest inundation (Limpus et al., 2003). The present study uses a geographic information system (GIS) to map the impacts of projected SLR, in terms of inundated area, under four SLR scenarios on a selection of sites used for nesting by this threatened population. The impacts of SLR on sea turtle nesting grounds has previously been quantified in Bonaire and Barbados (Fish et al., 2005, 2008), the east coast of the USA (Daniels et al., 1993) and the Hawaiian Islands (Baker et al., 2006). However, there has been no study in Australia, an area that contains globally significant marine turtle populations. In addition, prior studies, with the exception of Baker et al. (2006), focus on the impacts to only one rookery for a particular turtle population. Such an approach does not provide a full understanding of how a genetic stock (management unit) will be affected and respond to SLR. Since sea turtles may shift nesting grounds when nesting habitat is no longer available (Hamann et al., 2007) there is also the need to investigate how a variety of nesting grounds for the same population will be affected. Considering this, the impacts of SLR on eight different sites in north-east Australia, representing 99% of nesting activity for the nGBR green turtle population (Limpus et al., 2003), were investigated. This ensures that managers will be able to direct and focus management and conservation actions strategically to protect the nGBR green turtle population Figure 1. Location of rookeries utilized by the nGBR green turtle from impacts of SLR. The ecological impacts of loss and population and their relative importance as a nesting ground. alteration of nesting habitat on the nGBR green turtle population are also discussed. Characteristics of rookeries Beach profiles were measured at Bramble Cay, Dowar Island (north, south and west beaches) and Milman Island relative to METHODS low water mark at 100 m intervals (except at Dowar where a 50 m interval was conducted), using the dumpy level standard surveying technique (Mwakumanya and Bdo, 2007), where Rookeries elevation of points (z) along the transect are calculated from Nesting by the nGBR green turtle population occurs, in order slope and ground distances. Waypoints (x and y) were of importance, at : (1) Raine Island (111360S, 1441010E), (2) recorded at each elevation point from the profile transects Moulter Cay (111260S, 1441000E), (3) Bramble Cay (91090S, using a global positioning system (GPS) as well as bearings. 1421530E),(4) Dowar Island (91550S, 1441020E), (5) MacLennan The x, y and z coordinates for each point from the beach Cay (111220S 1431 480E), (6) Sandbank 7 (131260S; 1431580E), profiles were used to construct triangulated irregular network (7) Sandbank 8 (131210S; 1431570E) and (8) Milman Island (TIN) models for each beach using the 3-D analyst tool in s (111100S; 1431 000 E) (Figure 1). The highest concentration of ArcGIS . Data from Raine Island were collected using Real nesting occurs at Raine Island and Moulter Cay, with 90% of Time Kinematic (RTK) GPS. Beach width, mean and the overall nesting for this population (Limpus et al., 2003). maximum elevation values and area available for nesting for Smaller, but significant, numbers of nests are laid at both each beach were obtained from the TIN models. Beach profiles Bramble Cay and Dowar Island in Torres Strait. Nesting at for Moulter Cay, MacLennan Cay, Sandbank 8 and 7 were Dowar occurs at three distinct beaches: the north, south and derived from existing information on their elevation profiles west beaches. Lowest nesting density occurs at Milman Island and morphology (King and Limpus, 1983; King et al., 1983a, (Dobbs et al., 1999). Raine Island, Moulter Cay, MacLennan 1983b). Spatial information for Moulter Cay was obtained Cay, Sandbank 7 and Sandbank 8 are non-vegetated or from an aerial photograph taken in 1990 (0.25 m pixel vegetated sand cays and Milman Island is a forested cay, resolution). located in the nGBR (Figure 1). Bramble Cay is located on a fringing reef around a small volcanic outcrop in the north-east Nesting activity of Torres Strait. Dowar Island is one of the Mer group islands, which are volcanic high islands fringed with Holocene reef. All Surveys of nest location were carried out to determine the spatial rookeries are small in size (0.02 to 0.3 km2). distribution of nests and the preferred nesting habitat–in terms of Copyright r 2009 John Wiley & Sons, Ltd. Aquatic Conserv: Mar. Freshw. Ecosyst. (2009) DOI: 10.1002/aqc POTENTIAL IMPACTS OF PROJECTED SEA-LEVEL RISE ON SEA TURTLE ROOKERIES elevation and distance from high water mark (HWM)–at each from an intermediate sea-level rise scenario (0.35 m) was rookery. Owing to logistical and time constrains, surveys for turtle considered as a measure of vulnerability (modified method nests were carried out only at Bramble Cay, Dowar Island, from Fish et al., 2005), and Pearson’s Correlation was used to Milman Island and Raine Island. Monitoring occurred during the examine the effects of each physical attribute and vulnerability 2006/2007 nesting season, which was a high nesting season with up to SLR. to 21 000 turtles nesting per night at Raine Island (CJL, unpublished data). Monitoring at Raine Island was conducted Threat to nesting area during storm events by Queensland Parks and Wildlife (QPW) as part of their annual monitoring programme, which has taken place since the 1970s As it is anticipated that waves will penetrate even further (Limpus et al., 2003).
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